Visual Inspection of the Variable Stator Vane (VSV) System [CFML]

TASK 75-32-05-200-801-A
Visual Inspection of the Variable Stator Vane (VSV) System

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

ZONE: 400

1. Reason for the Job
This procedure covers visual inspection of all external High Pressure Compressor (HPC) variable geometry hardware for both the Inlet Guides Vanes (IGVs) and all four stages of Variable Stator Vanes (VSVs).
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	1	BORESCOPE SET
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-28-00-910-808-A	Standard Blending Procedure
TASK 71-00-51-000-803-A	Removal of the Power Plant with 2D Bootstrap
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 72-00-00-920-805-A	Off Schedule Vane Replacement
TASK 75-32-05-000-801-A	Removal of the Right Variable Stator Vane (VSV) Actuator
TASK 75-32-05-000-802-A	Removal of the Left Variable Stator Vane (VSV) Actuator
TASK 75-32-05-400-801-A	Installation of the Right Variable Stator Vane (VSV) Actuator
TASK 75-32-05-400-802-A	Installation of the Left Variable Stator Vane (VSV) Actuator
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Compressor Front Stator Assembly

3. Job Set-up
Subtask 75-32-05-941-050-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 75-32-05-010-050-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 75-32-05-040-050-A

C. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 75-32-05-010-051-A

D. Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

4. Procedure
Subtask 75-32-05-210-050-A

A. Visual Inspection of the Inlet Guide Vane (IGV) Variable Stator Vane (VSV) Systems

NOTE: If there is distress on a vane actuating arm, or if it is assembled incorrectly and causes vane scheduling errors more than four degrees, a special inspection/disposition of the compressor rotor blades is necessary.

NOTE: The use of the BORESCOPE SET equipment is permitted to facilitate hardware the inspection of the variable stator hardware.

(1) Do an inspection of the areas that follow:
(a) If an IGV or a VSV is found to be off schedule (e.g. because of a bent vane actuating arm), refer to this task (Ref. AMM TASK 72-00-00-920-805).

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.The forward compressor stator case for:
Cracks	Not serviceable	Remove the engine to replace the case (Ref. AMM TASK 71-00-51-000-803).
Nicks, pits, scores and scratches.	Any number, any length up to 0.005 in. (0.13 mm) in depth after the removal of the high metal	Do the Hand blending procedure (Ref. AMM TASK 70-28-00-910-808).
2.The IGV and the VSV actuation rings for:
Cracks in the actuating ring	Not serviceable	Remove the engine to replace the actuating ring (Ref. AMM TASK 71-00-51-000-803).
Distortion, bends, twists or a broken ring	Not serviceable	Remove the engine to replace the actuating ring (Ref. AMM TASK 71-00-51-000-803).
Nicks, dents and scratches in all the areas of the actuating rings	Any amount up to 0.01 in. (0.25 mm) in depth after the removal of the high metal	Do the Hand blending procedure (Ref. AMM TASK 70-28-00-910-808).
Damaged or broken actuating arm bushings	The bushing body is not damaged and gives a 360-degree support to the actuating arm pin.	If the bushing body is not serviceable, remove the engine to replace the bushings (Ref. AMM TASK 71-00-51-000-803).
Missing bushings on the IGV	One missing bushing permitted.	1) If two bushings spaced more than 60 degrees apart are missing: Remove the engine to replace the bushings within five flight cycles or 30 hours, whichever occurs first (Ref. AMM TASK 71-00-51-000-803). 2) Two missing bushings spaced less than 60 degrees apart, or three or more missing bushings are not permitted. Remove the engine to replace the bushings (Ref. AMM TASK 71-00-51-000-803).
Missing bushings on VSV stage 1	Two missing bushings are permitted.	1) If three bushings are missing: Remove the engine to replace the bushings within five flight cycles or 30 hours, whichever occurs first (Ref. AMM TASK 71-00-51-000-803). 2) Four or more missing bushings are not permitted. Remove the engine to replace the bushings (Ref. AMM TASK 71-00-51-000-803).
Missing bushings on VSV stages 2 thru 4	Three missing bushings per stage permitted.	1) If four bushings per stage are missing, repair within five flight cycles or 30 hours, whichever occurs first. Do this task: remove the engine to replace the actuating ring flanged bushings (Ref. AMM TASK 71-00-51-000-803). 2) Five or more missing bushings in each stage are not permitted. Do this task: remove the engine to replace the actuating ring flanged bushings (Ref. AMM TASK 71-00-51-000-803).
Missing or broken bushing legs	Two missing or broken bushing legs are permitted.	If three legs are broken, remove the engine to replace the actuating ring flanged bushings (Ref. AMM TASK 71-00-51-000-803).
Cracked or distorted ring spacer	Not serviceable	Remove the engine to replace the actuating ring spacer (Ref. AMM TASK 71-00-51-000-803).
Wear on the ring spacer buttons	0.01 in. (0.25 mm) minimum at Dimension E	Remove the engine to replace the actuating ring spacer (Ref. AMM TASK 71-00-51-000-803).
Looseness on the ring spacer nuts	Not serviceable	Tighten actuation ring spacer nut again.
3.The actuation ring connector link for:
Cracks or broken on one or both sides	Not serviceable	Remove the engine to replace the actuating ring connector link (Ref. AMM TASK 71-00-51-000-803).
Nicks, dents and scratches in all the areas of the connector link	Any amount up to 0.01 in. (0.25 mm) in depth after the removal of the high metal	Do the hand blending procedure (Ref. AMM TASK 70-28-00-910-808).
Bushings with broken or missing legs	Two damaged or broken bushing legs are permitted.	If three legs are broken, remove the engine to replace the bushings (Ref. AMM TASK 71-00-51-000-803).
Missing or broken bushings.	Not serviceable	Remove the engine to replace the bushings (Ref. AMM TASK 71-00-51-000-803).
4.The vane actuating arms, IGV and VSV stages 1 thru 4 for:
Broken, bent or cracked	Not serviceable	Broken or bent vane actuating arms can lead to off scheduling of IGV or VSV. If an IGV or VSV is found to be off schedule refer to this task (Ref. AMM TASK 72-00-00-920-805). Remove the engine to replace the actuating arm (Ref. AMM TASK 71-00-51-000-803).
Nicks, dents and scratches.	Area G is not serviceable.	Remove the engine to replace the actuating arm (Ref. AMM TASK 71-00-51-000-803).
	0.010 in. (0.25 mm) in Area H after the removal of the high metal.	Do the hand blending procedure (Ref. AMM TASK 70-28-00-910-808).
5.The vane actuation system (the bellcrank assembly) for:
Cracks	Not serviceable	Remove the engine to replace the bellcrank assembly (Ref. AMM TASK 71-00-51-000-803).
Nicks, dents, scores and scratches on the IGV to stage-4 bellcranks or actuator link	Any amount, any length, 0.015 in. (0.38 mm) in depth after you remove the high metal.	Do the hand blending procedure (Ref. AMM TASK 70-28-00-910-808).
Nicks, dents, scores and scratches on the bellcrank plates and the master rod.	Any amount, any length, 0.030 in. (0.76 mm) in depth after you remove the high metal.	Do the hand blending procedure (Ref. AMM TASK 70-28-00-910-808).
6.The VSV actuator rod assembly for:
Cracks	Not serviceable	Replace the VSV actuator (Ref. AMM TASK 75-32-05-000-801) and (Ref. AMM TASK 75-32-05-400-801) or (Ref. AMM TASK 75-32-05-000-802) and (Ref. AMM TASK 75-32-05-400-802).
Nicks, dents, scores and scratches.	Not serviceable	Replace the VSV actuator (Ref. AMM TASK 75-32-05-000-801) and (Ref. AMM TASK 75-32-05-400-801) or (Ref. AMM TASK 75-32-05-000-802) and (Ref. AMM TASK 75-32-05-400-802).
7.The spherical bearings for:
Looseness of ball	0.002 in. (0.05 mm) max. circumferential movement	If more than 0.002 in. (0.05 mm), remove the engine to replace the spherical bearings (Ref. AMM TASK 71-00-51-000-803).
8.The turnbuckles for:
Cracks	Not serviceable	Remove the engine to replace the turnbuckles (Ref. AMM TASK 71-00-51-000-803).
Nicks, dents, scratches and scores	Any amount, any length, 0.005 in. (0.13 mm) in depth after you remove the high metal.	Do the hand blending procedure (Ref. AMM TASK 70-28-00-910-808).
A loose hexagonal nut.	Not serviceable.	Tighten the hexagonal nut again.
9.The vane spindle bushings for:
Missing bushings	Not serviceable	Remove the engine to replace the vane spindle bushings (Ref. AMM TASK 71-00-51-000-803).

5. Close-up
Subtask 75-32-05-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 75-32-05-440-050-A

B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 75-32-05-410-051-A

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:15:00 UTC